<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .container {
        width: 100px;
        height: 100px;
        border: 1px solid red;
        border-radius: 15px 15px 0px 15px / 15px 15px 0px 15px;
      }

      .txtBlue {
        /* outline: none; */
        border: none;
        outline-offset: 5px;
        outline: 1px red dashed;
      }
      .ul li:nth-child(n+5):nth-child(-n+11) {
        background-color: lightpink;
      }
    </style>
  </head>
  <body>
    <h2>border-radius 的用法</h2>
    <div class="container"></div>
    <hr />
    <h2>input 标签outline用法</h2>
    <input type="text" class="txtBlue">
    <hr>
    <h2>选中连续的元素</h2>
    <ul class="ul">
      <li>1</li>
      <li>2</li>
      <li>3</li>
      <li>4</li>
      <li>5</li>
      <li>6</li>
      <li>7</li>
      <li>8</li>
      <li>9</li>
      <li>10</li>
      <li>11</li>
      <li>12</li>
    </ul>
  </body>
</html>
